Each user registers initially (or is registered by someone else, such as a systems administrator), using an assigned or self-declared password.
On each subsequent use, the user must know and use the previously declared password.
However, password-based authentication is not considered to provide adequately strong security for any system that contains sensitive data.
The three most common categories are often described as something you know (the knowledge factor), something you have (the possession factor) and something you are (the inherence factor).Password-based authentication weaknesses can be addressed to some extent with smarter user names and password rules like minimum length and stipulations for complexity, such as including capitals and symbols.However, password-based authentication and knowledge-based authentication (KBA) are more vulnerable than systems that require multiple independent methods.With the increasing number of Internet-enabled devices, reliable machine authentication is crucial to allow secure communication in home automation and other networked environments.In the Internet of things scenario, which is increasingly becoming a reality, almost any imaginable entity or object may be made addressable and able to exchange data over a network.The two terms are often used synonymously but they are two different processes. Experts Craig Mathias, Michael Cobb, and Randall Gamby weigh in on the advantages and disadvantages of 3 different authentication strategies: biometrics, 2FA and MFA.